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mm: skip memory block registration for ZONE_DEVICE

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Prevent userspace from trying and failing to online ZONE_DEVICE pages
which are meant to never be onlined.

For example on platforms with a udev rule like the following:

  SUBSYSTEM=="memory", ACTION=="add", ATTR{state}=="offline", ATTR{state}="online"

...will generate futile attempts to online the ZONE_DEVICE sections.
Example kernel messages:

    Built 1 zonelists in Node order, mobility grouping on.  Total pages: 1004747
    Policy zone: Normal
    online_pages [mem 0x248000000-0x24fffffff] failed

Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dan Williams 2016-01-15 16:56:17 -08:00 • committed by Linus Torvalds
commit 260ae3f7db
2 changed files with 25 additions and 0 deletions
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13
drivers/base/memory.c
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@ -647,6 +647,13 @@ static int add_memory_block(int base_section_nr)
return 0;
}
static bool is_zone_device_section(struct mem_section *ms)
{
struct page *page;
page = sparse_decode_mem_map(ms->section_mem_map, __section_nr(ms));
return is_zone_device_page(page);
}
/*
* need an interface for the VM to add new memory regions,
@ -657,6 +664,9 @@ int register_new_memory(int nid, struct mem_section *section)
int ret = 0;
struct memory_block *mem;
if (is_zone_device_section(section))
return 0;
mutex_lock(&mem_sysfs_mutex);
mem = find_memory_block(section);
@ -693,6 +703,9 @@ static int remove_memory_section(unsigned long node_id,
{
struct memory_block *mem;
if (is_zone_device_section(section))
return 0;
mutex_lock(&mem_sysfs_mutex);
mem = find_memory_block(section);
unregister_mem_sect_under_nodes(mem, __section_nr(section));